| Autor: |
Tagliabò, Fulvio, Ciappa, Manfredi, Fiaccola, Gaetano, Le Bourdellès, Odile |
| Předmět: |
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| Zdroj: |
Ingénieurs de l'Automobile; sep2016, Issue 843, p76-81, 6p |
| Abstrakt: |
The first objective of this paper is to propose a methodology to optimize functional safety system analysis. If Freedom From Interference is verified in a system, it is possible to define system architecture sub-sets that comprises only those HW and SW parts whose faults may cause a violation of a Safety Goal (one sub-set per each Safety Goal). Each sub-set, as well as its defined representation, is called Safety Chain. The Safety Chain can then be divided in HW and SW Safety Paths, useful to perform Functional Safety analyses. The second objective is to propose an approach, aligned with recent developments of functional safety theory, focused on the evaluation of HW architectural metrics (in particular the Latent Fault Metric) coherent with the system under analysis. The approach discriminates if the covered fraction of a single point fault should be considered as latent fault or not, depending on the type of safety mechanism in place. Safety mechanisms can be divided by their reaction to faults, between those performing detection and control and those based on the controlling fault effects. The two types should be considered differently during evaluation of their contribution to Latent Fault Metric. Finally, this paper helps to understand why ISO 26262-5.8.4.8 alternative c) is restricted to safety mechanisms performing fault detection and control. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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